ArrayAccess(数组式访问)接口
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提供像访问数组一样访问对象的能力的接口。
Example #1 Basic usage
<?php
class obj implements arrayaccess {
private $container = array();
public function __construct () {
$this -> container = array(
"one" => 1 ,
"two" => 2 ,
"three" => 3 ,
);
}
public function offsetSet ( $offset , $value ) {
if ( is_null ( $offset )) {
$this -> container [] = $value ;
} else {
$this -> container [ $offset ] = $value ;
}
}
public function offsetExists ( $offset ) {
return isset( $this -> container [ $offset ]);
}
public function offsetUnset ( $offset ) {
unset( $this -> container [ $offset ]);
}
public function offsetGet ( $offset ) {
return isset( $this -> container [ $offset ]) ? $this -> container [ $offset ] : null ;
}
}
$obj = new obj ;
var_dump (isset( $obj [ "two" ]));
var_dump ( $obj [ "two" ]);
unset( $obj [ "two" ]);
var_dump (isset( $obj [ "two" ]));
$obj [ "two" ] = "A value" ;
var_dump ( $obj [ "two" ]);
$obj [] = 'Append 1' ;
$obj [] = 'Append 2' ;
$obj [] = 'Append 3' ;
print_r ( $obj );
?>
以上例程的输出类似于:
bool(true) int(2) bool(false) string(7) "A value" obj Object ( [container:obj:private] => Array ( [one] => 1 [three] => 3 [two] => A value [0] => Append 1 [1] => Append 2 [2] => Append 3 ))